Typically, when a user moves the mouse pointer over an object that has a tooltip, there is a delay before the tooltip is displayed. This delay is equal to the value of the InitialShowDelay property. However, after a tooltip is displayed there is a period of time during which another tooltip can be displayed without waiting for the InitialShowDelay time to pass. You specify this time period by using the BetweenShowDelay property. When the user moves the mouse within this time period from one element that has a visible tooltip to another element that has a tooltip, the value of the InitialShowDelay property for the second tooltip is not applied and the second tooltip appears immediately.